The body of a local, reputed saint called John Schorne was brought to St George's Windsor in 1478 to coincide with the rebuilding of the chapel by Edward IV. In recent years numerous lead badges depicting the saint have been found in archaeological excavations in London and elsewhere. These were bought by devotees to celebrate their pilgrimage and testify to the Schorne's popularity.

Very little is known about John Schorne beyond the fact that he was rector of North Marston in Buckinghamshire between about 1282 and his death in 1314. In the later Middle Ages he was popularly believed to have studied at Oxford and was sometimes depicted wearing academic dress. By reputation he was a saintly man who dutifully served his parish, but he was never actually canonized.

Schorne was credited with particular powers including healing gout and toothache and reviving the drowned. It was in celebration of this first ability that he is usually depicted holding a boot with the devil emerging from it: the devil, who is causing the pain, is being exorcised by his power. Schorne is also associated with a well in North Marston and the water from this was used to cure colds and fevers.

Upon its removal from North Marston John Schorne's body was placed in the east end of the south choir aisle at Windsor, a space it shared with the Cross of Gneth and, from 1484, the venerated body of Henry VI. Surviving building accounts show that it was provided with a new wooden coffin and an elaborate iron offertory box, apparently very similar to that which survives beside Henry VI's tomb. It is not known precisely where the body lay or how it was displayed but there was a boot which pilgrims could put on to heal their gout. This appears to have served as a counterpart to Henry VI's hat, which could be put on by those suffering from headache.